{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Exposure concentrations were selected and anchored to the positive control , 17 beta - estradiol ( E2 ) , based on previously determined behavioral or teratogenic phenotypes ."}
{"Chemical": ["17 beta - estradiol"]}